Process of making roofing felt or like material



Oct, 27, 1925. 1,558,495

F; C. OVERBURY PROCESS OF MAKING ROOFING FELT OR LIKE MATERIAL Original Filed July 29, 1915 FT 5. L

IN WEN T5 3:

EBIJVE EILJF I a 'I Patented Oct. 27,1925. I

UNITED STATES I 1,558,495 PATENT OFFICE.

FREDERICK c. OVERBURY, or nILLsD'ALE, NEW JERSEY, ASSIGNOR, BY MESNE AS- SIGNMENTS, TO THE FLIN'IKOTE COMPANY, or BOSTON, MASSACHUSETTS, A con- PORATION OF MASSACHUSETTS.

PROCESS OF MAKING ROOFING FELT OR- LIKE MATERIAL.

Application filed July 29, 1915, Serial No. 42,628.

To all whom it may concern:-

Be it known that I, FREDERICK C. OVER- BURY, a citizen of the United States, and a resident of Hillsdale, in the county of Bergen and State of New Jersey, have invented certain new and useful Improvements in Processes of Making Roofin Felt or like Material, of which the following is a specification.

This invention has for its object to produce a fibrous material which will possess strength and flexibility and also marked fireproof qualities. 7

Figure 1 represents conventionally, 111 section a portion of a sheet embodying the invention.

Figure 2 similarly represents a sheet embodymg'the invention, for use as a roof covering.

According to my invention and to meet the object thus specified, I provide a multiply sheet formed of layers of paper felt and asbestos, the fibers of the several layers being intermingled and adherent, so 25 that the sheet is an integral structure.

In the manufacture of this sheet, the paper felt la er a is formed of cotton and wool or 0t er suitable fiber in the usual manner, into a wet pulpy web,,upon which is deposited a wet pulpy web of asbestos fiber b. These'may be then subjected to a felting action in a machine or apparatus of the ordinary construction, or be dried in the usual dryin machine, thus producing a sheet, one ace of which is paper felt (so-called) and the other face of which is asbestos, the two layers being interlocked I together by the intermingli-ng of their fibers without the use of any foreign binder or cement.

It is quite apparent that the sheet may consist of more than two layers of the asbestos and of the Wool fiber, as for instance the layer of asbestos can be laid between the layers of Wool felt, or vice versa.

After the sheet has been dried into a porous absorbent condition, it then may be saturated with asphalt or any other of the usual waterproofing compositions which are employed in the manufacture of prepared roofings, and then faced, preferably on the wool-felt side, with a layer of high-meltingpoint asphalt or .pitch a, as shown in Figure Renewed November 14, 1919. Serial No. 338,118.

produce commercially a roofing material which is substantially fireproof. It has been proposed to cement together, as by the use of pitch, sodium silicate, or the like, a layer of asbestos upon a layer of roofing felt, but this increases the cost of production of the roofing material. Sheet asbestos, when sufiiciently thin to be used alone, does not possess the necessary tensile strength, whereas wool felt alone, while relatively slow-burning when impregnated as described, does not really possess the desirable fireproof qualities. According to my invention, I provide a single integral sheet, in which the strength is afforded by the felt layer, and the fireproof qualities of the asbestos layer.

It is unnecessary herein to describe the operations by which the raw material, cotton ,or wool rags, or the asbestos, are disintegrated and reduced to awet fibrous pulp, or the machines by which they are formed into webs 01'' layers, as the same are well known. 7

If desired, the sheet may have only the felt layer saturated or coated, or both, with a waterproofing or non-heat-conducting compound, or the asbestos layer may be saturated or coated, or both, in either instance leaving the other layer untreated, this being of course subject to particular requirements.

While the composite sheet as herein described is particularly applicable for use in the manufacture of flexible waterproof roofing, yet its use is not confined thereto, as it may be employed for a variety of other uses. For instance, but without limitation, the sheet may be'employed for the purpose of insulation, or as a flooring, or for other purposes.

For some purposes, the sheet may be so treated as to saturate with a waterproofing or non-heat-conducting compound only the fibrous layer, leaving the asbestos layer unsaturated, or vice versa.

What I claim is 2- The herein described method of produc- 5 ing-a flexible composite sheet of fibrous material, consisting in bringing into face contact two layers of wet pulpy felted fiber and asbestos fiber, causing the said fibers of said layers to interlock, and then drying the sheet thus formed. 10

In testimony whereof I have aflixed my signature.

FREDERICK 0. OVERBURY. 

